Screw-press.



C. F. SEHUN.

SCREW PRSS.

Mwucwo mi@ man zo. m4.

Ll?. Puwndsept. 7, 1915.

2 SHIES---SHECT 2.

CHARLES F. STEHLIN, OF NEW ROCHELLE, NEW YORK.

SCREW-PRESS.

Specification of Letters Patenth Patented Sept. 7, 1915.

Appition led July 20. 1914. Serial Ho. 851,853.

To all rom may concern:

Beitlmownthat LCR-urnes F. Srnnmxga citisen of the United States, and a resident of New Rochellecount-y of Westchester, and State of New York, have invented certain ner.` and useful Improvements in Screw- Presses. of which the following is a speciication.

My invention relates to screw presses for extracting water and other liquids from mlid matters containing the same, and is designed to improve the saine in several importent particulars whereby the eieiency of such presses is greatly increased. One source of lost power and reduced eiliciency in pmses of this sort has been eine to a chui-ni' action of the material in the hopv per or chute where it is delivered to the screw. Aording to my invention means are provided for preventing such churning or regurgitation and thereby increasing the ecieney of the apparatus and preventing the loss of power in this respect.

- My invention provides means whereby the moisture to be extracted may be driven inwardljv' as well as outwardly, thus obtaining more duid extractand a. drier solid product. without the application o increased power.

Another feature of my invention consists in the provision of an improved form of outlet adnsting device whereby the size of the outlet may be readily and convenientlyr adinsted, thus facilitating the adjustment of the apparatus for working on materials of dietent kinds and for the various requirements which-it has to meet.

- With the foregoing and related objects in view, my invention consists in the paris, improvements and combinations herein set eo forllr ,Y v dm i t e aocompan o part of this speciieawn andlllsiereilnnili sane reference numerals are uniformly used to designate the same parts throughout, e5 Figure 1 is e view, partly in central longitudinal serion, of one form of screw prs embodying myimprovements. Fig.2is across sectional view on the line 2 2, Fig. 1. Fig. 3 isa crosectional view on the line 3 3. Fig. 1- .Fig. 4 is a detail view sil'nilar to a portion of- Fg. 1. Fig. 5 is an elevational view of the interior discharge member, and Fig. 6 is a fragmental-y longitudinal sectional view showing the preferred construction of the interior discharge member.

The reference numeral 10 is applied to designate generallyv the box-line frame of the machine. ln the form shown it is proded with legs 11, l1. `Within the box 10 is the press casing 12 which is of the usual construction. being made of perforated metal and covered on its exterior with netting or sheet metal having tine perforations. This part. of the apparatus beingg` no part of the present invention. it is not illustrated in detail. Within the casing 12 is received the pre :eren 13. and the moisture or Huid extracted and paing through the walls of the casing 12 isV permitted to escape. as by means of the pipe 14, in the usual manner. Any suitable means for supporting the casing 12 within the box 10 inav be used.

The chute or hopper through which the material to be treated is supplied to the press is indicated at 15, and an agitator for preventing such material from packing, and prefembly comprising the shaft 16 and :1x-ms 17. is provided. Such agitator preferably is rotated intermittently, as by means of the intermittent rotating connections 1S on the shaftll and 19 on the shaft 20 of the pres screw. The screw shaft 20 may be rotated from any convenient source of power which may be applied, for example, through the bevel gear 21 and pinion '22.

For oreventi the chu action of the material feflilgto the sm'lernre at the bottom of the hopper or chute 15, I provide a plate 23, preferably of thin metal, such as sheetsteel or the like, and the same is free except atits upper edge where it may be secured,ras for example to the walls of the chute or hopper 15 as by'means of the screws 24. At its opposite edge it extends fairly close to the screw 13. (See Fig. The press screw 13 being rotated in the direction of theerrow in 3, when material is fed into the apparatusA the space beneath and behind the plate 23 is quickly filled with the mai-ial under treatment, and such material thereafter is fed to the front of thepres screw and is readily taken hold of by such screw and fed into the space be tween the screw and casing. The plate 23 of spring material will give somewhat, and thus serves to balance the pressures upon its faces, and if any solid objects, such as bolts or stones, find their way into the apparatus, the spring of such plate will readily permit them to pass by without the breakage which might result if such plate were rigid and unable to give under excessive pressure. Another feature which contributes to the certainty of the feeding aotion of the screw and to preventing any churning or regurgitation consists in the formation of the portion of the press .screw which is immediately beneath the hopper or chute. Such part of the prem screw, indicated at 25, has the form of a simple con reyer and there is no enlargement of the screw core in this neighborhood so that the material is readily taken hold of by the screw and pushed forward into the region between the screw and casing,l and there is no attempt in this neighborhood to exercise any compressing action on the material. This combined provision of the spring guide-plate :23 and the simple conveyer screw portion :25 resnts in a much improved feeding action and in there being no churning of the material at this point and substantially no failure of the screw to take hold of the material and advance it into the region where it should go.

At the opposite or discharge end of the casing 12 is provided the interior uid dis charge device which is dignated by the referen numeral 26 and the construction whereof is shown clearly in Figs 4, 5 and 6. 'This interior discharge member has the form of a hollow shell having axial perforav tions at 2T and 28 to permit the passage of the screw shaft 20 axially therethrough. The walls of such hollow casing are provided with fairly large perforations as indicated at 29 and such casing is covered on its exterior with a covering of reticulated or finely meshed material' 30, this permitting the passage of duid therethrough and its dischalgethinto the ingrio'lh of the casing throng e openlnu c's e o mnt Us 39 are preferably connterbored orpitherwise enhirged near their outer ends, as indicated at. :7.92 to bring them into communication with substantially ail the small apertures in the ontelscreen 30. The member 26 is provided with an outer end portion 30, also rustoconical in shape and Baring more markedly than the perforated portion of the member 26 back thereof. By means of the provision of sich outer nnperforated portion ."0s the parte may be adjusted so as to leave a comparatively sml opening around the member 26 and still have enough thickns of materia] between the casing 10 and member 26 to obtain a substantial expulsion of moisture to a neighborhood very close to the mouth of the casmg 10. Arny snitable means, as, for instance, the

, nipple 31 inserted in an opening 32 and properforated or reticulated covering 30 is prefcrably let into the casing 26 as by providing shoulders 3i. 35, as shown in Figs. 4 and 6. The edges of the covering 30 are preferably lapped over one another and secured in lace along a diagonal line as 3T by means o fastening members, such as screws 38. It will be observed that the outer lap of the reticulated covering 39 is so placed as that the material rotating in the direction of the movement of the press screw 13 pass over such outer lap first and onto the under portion thereof, thus doing away with any tendency to tear away' or to bend back the exposed edge of such reticulated covering 30. In the form shown the interior discharge member 26 is comparatively short and is formed with a fairly abrupt taper. It is understood, however, that the particular proportions illus rated may be varied and that, for example, such member may be much longer than shown. Furthermore, the press screw 13 is shown with the tapered core with which such screws are customarily provided. If preferred, however, such tapered core may be dispensed with and the screw may be used solely for the purpose of pressing the material ebtween the interior discharge member and the casing of the press.

The interior discharge member 26 is prevented from rotating by any convenient means, as, for instance, the pin 39 entering an opening within the boss i0 and resting against the frame 10, or supported in any convenient manner.

The tapered interior discharge member 26 may be adjusted with reiation to the prem casing. and I have shown a very convenient and eective means for securing such adjustment, comprising the screw 11 received in a screw-threaded opening 1.12 in the frame member 43 and which is preferably so received in place as to be readily removable, thus facilitating assembly and taking apart for repairs. Such screw -il is provided with any convenient means for mnmmilv imparting` rotation thereto. as. for instance` the hand-wheel 1.4 which extends bevond the frame member i3 and is in a position where convenient acces ma?? be had thereto. The screw 41 has an axial bore 45 therethrough for the passage of the prem screw shaft 20 and is so arranged with respect. to the boss 6 on the interior discharge device '26 as to be capable of rotation with respect thereto, but incapable of lengthwise increment with respect thereto. In the form shown such relative arrangement is secured by providing the bos i6 with a circumferential groove 4T and providing the enlarged re cessed portion 4S of the qrew 41. in which the bom 46 is received, with a bolt 49 having an extension 50 received within the groove 47. With such arrangement the screw-il may be freely rotated without impart-ing any rotation to the member '26. but lengthwise movement of the screw il re snlts in similar lengthwise movement of the member '25. It will be seen, therefore, that by rotating -the hand-wheel 44 the position of the tapered member 26 with rewect to the'casing lmaybe varied at will and the extent of the annular opening 51 between the member 26 and the mouth of the @sing 12' may be correspondingly varied. Several os'ticns of the member 26 are indicated in o ed lines in Fig. 4. As will be readily understood, the member 26 is adinsted close to the'A casing 12 when an especially dry product is desired. and if more moisture is admisible to be retained in the solid prod- `failure to feed hertofore'oomm d Yit'ed beingprevented by the sp1-lng plate 23.

not. the annular opening 51 is enlarged by the member 26 from the mouth ofV the casing l.

The. operation of the apparatus is as follows: The moisture containing material is introduced through the chute or hopper 15 and is kept from" packing by the agitator blades 1T and is delivered by gravity on top ofthe section of the press screw 14 by it is fed forward between the screw 13 and the easing 1:2, the ch 0 up and v exhib .as the material progrees between` the screw 13 the eang 12 and .is-held back b v the member 26, the moisture isiextracted and a of it passes ont through the openmgsin'the cas'mg 12 and the pipe 14. After leaving the screw 13 the material paes toward the annular outlet 5i and is compreed, by the material following it, between the walls` of tbelchamber 26 and theising l2, and the exfehdedopenings afforded in the chamber 26 permit the extraction of amnch larger quantity of moisture than is poibie through the casing walls 12 aione. Furthermore, the member Q6 being substantially stationary except when it is adusted lengthwise. and the ma terial tmveling fairly slowly thereover. very favombie opportunity is presented for the escape of any moisture which mar be forced ont b v the compresion. In order to vary the size of the dischare opening 51. the hand-wheel -lis cpem'ted tc turn the screw i almidf: described- B v means of the outlet. pipe 133 the mosicre discharged into the member 26 is conducted away from the dry material which fails into any suitable reeepacle or convever. as. for instance, the worm convever arranged in the trough 53. b v means of which the dxv product may he conveyed sway to any desired point.

ltis to be understood that the precise form of apparans shown in the drawings is for the pnrpcse of illustration only and that mi: invention is not confined to such specific strnctnre, but that departure may be made therefrom and modifications may be made therein, within the scope of my claims, without departing from my invention or sacrificing an;r ci its advantages Having thus described my invention, I claim:

1. In a screw press, a screw, a casing, means for supplying material between said screw and casing at one side of the screw, and means at the opposite de of the screw for preventing the passing of material away from the rew, substantially as set forth..

2. In a screw press, a casing, a screw therein, a chute or hopper extending across the casing and in free communication with the space between the screw and casing on one side, and a plate on the other side of the screw for retaining material in contact with the screw, substantially as set forth'.

3. A screw pre comprising a screw and a perforated' casing, means for supplying material to said casing, and a plate of resilient mate-rial extending into the neighborhood of the periphery of the scremsobstam tially as set forth.

4. In a Screw press., a screw, a perforated casing therefor. a chute or hopper for supplying material, and a plate of resilient maferial secured to the chute or hopper at one margin and extending into the neighborhood of the screw at the other margin. snstan` ially as set forth.

5. in a screw press, a screw, a perforated easing therefor. a chute or hopper for snpplying material, an agitator therein, and a thin curved plate of resilient material in said chute orhopper and secured thereto at one margin and extending into the neighborhood of the ,screw at the opposite man gin, substantially as set'forth.

6. In a screw casing therefor, a chute or hopper for snp ply-ing material, and a plate of resilient material secured to the side of mid chute or hopper at one margin and extending over said screw at the opposite margin, substantially as set forth.

7. In a screw press. the combination of a screw having its core partly tapered and partly substantially cylindrical. a casing encircling said screw, a chute or hopper for delivering material in the neighborhood where the core is substantially cylindrical, and a resilient guiding means in said chute or hopper and extending into the neighborhood of said screw. substantially as set forth.

S. In a screw pre, a press screw having a tapered core for a portion of its length and another substantiall)` cylindrical portion, a casing therefor. and means for snpplying material to said press in the neighborhood where the core of the screw is substantially cylindrical, substantially as set forth.

PmaPreSSei-ewanda.

9. In a screw press, a perforated casing, a press screw therein, resilient means for directing material to said press screw at the feeding side thereof, and an agitating device adjacent to the resilient directing means. substantially as set forth.

10. In a screw press, a substantially cylindrical casing, a hollow taered member said casino' and provi ed with perfoi-ated walls, said: member having its largest or outer end of greater flare than the inner portion thereof, and means for forcing material between the walls of said casing and those of the said tapered member, substantially as set forth.

11. In a screw prem, a substantially cylindrical casing, a hollow tapered member coam'al therewith and arranged within the month of said cylindril member und provided with perforations in its Walls, a pipe communicating with the interior of said tapered member for forming a discharge from the interior thereof, and means for forcngmaterial between said casing and the tapered member, substantially as set forth.

12. In a screw pros., a substantially cylindrieal casing. a hollow tapered member with perforated walls eoan'ally arranged within said casing and havinj an increased flare at its outer unperforated end, a screw in said casing, a shaft extending through said tapered member, and means for preventing rotation of said tapered member and screw relative to said casing, substantially as set forth.

13. In a screw pres, a substantially c`vlndril easing open at one end, a frustoconical member with perforated walls axially arranged in the mouth of the casing, and having an outer unperforated part of increased flare, means for adjusting said member longitudinally7 of the casing to vary the extent of annular opening between said casing and member, and means for forcing material between said casing and member, substantially as set forth.

14. In a screw press, a substantially cylindrical casing, a screw therein and having a shaft arranged axially thereof, a frustoconical member with perforated walls and having a central aperture through which the shaft extends, a screw-threaded sleeve having a bore through which the shaft also extends, a. iixed abutment having a @rewthreaded opening for said screw, and means of swivel connection between said sleeve and member, substantially as set forth.

15. In a screw press. a substantiallyr cylindrical casing, a shaft extending axially therethrough, a screw on a part of slid shaft', a frnstocon.ical member with perfo rated walls axially arranged on said shaft, means to prevent the rotation of said member. a screw-threaded sleeve on saidl shaft and having a swivel connection with said member, and means for impartincr rotation to said threaded sleeve, substantially as t forth.

In testimonyr that- I claim the foregoing, I have hereunto set my hand, this 17th day of July, 1914.

CHARLES F. STEHIJN.

M. A. Jomrsox, H. Tnavrvm'mz.

Copies of this patent may be ob'med for ive cen's each, by addressing the Commiioner of Patents, Washington, D. C.

It is hereby certified that in Letters Patent No. 1,] 52857, grunted September T. 1915, upon the application of Charles Fv Sluhlin. of New Rochelle No York. for nn improvement in Screw-Presses, errors oppeor in the printed specication requiring correction asfollows: Page 4, line 33, claim 12, after the wofd member" insert the words and screw; same page, line 35, strike out the words and screw and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ulce,

Signed and sealed this 28th day of September, A. D., 1915.

[SEAL] J. T. NEWTON,

Acting ommaswuer of Pams, 

